 |
 |
Test Analysis on Shear Strength Increment of Soft Soil under Embankment Fill
Guanbao Ye Key Laboratory of Geotechnical and Underground Engineering ,Tongji University, Ministry of Education, Shanghai, China Yongfa Guo Key Laboratory of Geotechnical and Underground Engineering ,Tongji University, Ministry of Education, Shanghai, China
| |
|
ABSTRACT |
Shear strength increment of soft soil may affect the stability of soft ground treated with prefabricated vertical drains (PVDs), and it is a hot topic research at present. In this paper, the in site static cone penetration test and vane shear test were arranged at the center line, the shoulder and the toe of the filling in order to identify the shear strength increment distribution in vertical and horizontal direction of the soft ground treated by PVDs under heaped load. The physical and mechanics tests were carried out with the soil from center line and 22m away from the filling toe. Indoor and in site tests results were presented in this paper. The results of in-site tests demonstrated that the shear strength increased 0.2~0.8 times and the increment is different from the center line to the toe in horizontal direction and within 13m depth. In addition, in order to forecast the shear strength increment with quantification equation,the shear strength polygonal line equation that considering the structure property of soft soil was presented. The polygonal line equation and the linear equation were compared by using the strength parameters acquired from the triaxial consolidated undrained shear (CU) test. The results showed that the outcome of polygonal line equation is closer to in-site vane test, therefore the polygonal line equation is superior to the straight line equation in respect of forecasting of shear strength increment. The study results could be referenced in similar projects.
Keywords: soft soil; shear strength increment; polygonal line equation; consolidated undrained shear test ; vane shear test; static cone penetration test.
Get the entire paper (pdf)
Go back to the TOC
